cel mai mare nr si cel mai mic nr

#include <iostream>

using namespace std;

int BubleSort(int[], int);
int main()
{
    int n;
    cout << "n="; cin >> n;
    int v[20];
    int k = 0;
    for (int i = n; i; i /= 10)
    {
        v[k] = i % 10;
        k++;
    }
    int ok;
    int i = 0;
    do
    {
        ok = 0;
        for (int j =0; j<k-i-1; j++)
        {
            if (v[j] > v[j + 1])
            {
                swap(v[j], v[j + 1]);
                ok = 1;
            }
        }
        i++;
    } while (ok);

    int nr_max = 0;
    for (int i = k-1; i >= 0; i--)
    {
        if (v[i]!=v[i+1])
             nr_max = nr_max * 10 + v[i];
    }
    int nr_min = 0;
    for (int i = 0; i < k - 1; i++)
        nr_min = nr_min * 10 + v[i];
    cout << "Nr max este:" << nr_max << endl;
    cout << "Nr min este:" << nr_min << endl;
    system("pause");
    return 0;
}